Incandescent electric lamp



(No Model.)

B; E. WEAVER 8: G. B. MANYPENNY. INOANDBSGBNT ELECTRIC mm.

Patented June 7, 1892,

UNITED STATES PATENT OFFICE.

EPHRAIM E. IVEAVER AND GUSTAVUS B. MAN YPENNY, OF PHILADELPHIA,

ASSIGNORS OF ONE-FOURTH TO JOHN WOOLHAN COMFORT AND WIL- LIAM STEELEAMBLEP, OF JENKINTOWN, AND JOHN CUNNINGHAM, JR., OF PHILADELPHIA,PENNSYLVANIA.

INCANDESCENT ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 476,501, dated June 7,1892.

Application filed December 5, 1891. Serial No. 414,093. (No model.)

To all whom it may concern.-

Be itknown that we, EPHRAIM E. EAVER and GUsTAvUs B. MANYPENNY, citizensof the United States, residing at the city of Philadelphia, in thecounty of Philadelphia and State of Pennsylvania, have invented certainnew and useful Improvements in Incandescent Electric Lamps, of which thefollowing is a specification.

Our invention relates in incandescent electric lamps to means forenhancing the brilliancy or illuminating power and effect thereof beyondthe normal candle-power of the same without having to increase theelectromotive force of the current employed for producing theincandescent illumination of the lamps.

The principal object of our invention is to provide a simple, durable,and comparatively inexpensive device or appliance for enhancing thebrilliancy or illuminating power and effect of an incandescent electriclamp beyond the normal candle-power thereof and without increasing theelectro-motive force of the current employed in the line-circuit foreffecting the incandescent illumination thereof.

Our invention consists of an incandescent electric lamp having a hollowreflector of iiregular, square, or elliptical cross-section forming theinner wall of the vacuum-chamber of the lamp and a filament, the twoparts of which are disposed in proximity to the points or ends of thereflector and supported by electrodes sealed to the socket of the lamp,the construction and arrangement of the hollow reflector being such thata supply of air is permitted around about the internal surface, wherebyoverheating or other damage to the reflecting-body of the lamp isprevented, substantially in the manner hereinafter described.

The nature and objects of our invention will be more fully understoodfrom the following description, taken in connection with theaccompanying drawings, formin part hereof, and in which- Figure 1 is avertical central section of an incandescent lamp embodying features ofour invention and showing a body or substance of reflecting material ormatter disposed between or about the filament of the lamp. Figs. 2, 3,and 4; are horizontal sections illustrating, respectively, theemployment of reflecting substances or materials of irregular, square,or elliptical cross-section.

In the drawings, a is the exterior bulb of the lamp. 1

b is the body or substance of reflecting material disposed within theloop of the filament c. This body or substance I) may be of curvilinearcross-section, as illustrated in Figs. 2 and 5, or of rectangular orsquare cross-section, as shown in Figs. 3 and 4c, orof any otherpreferred form or shape of cross-section, and may be made of anysuitable material that is provided with a surface that is adapted torefleet light. In the present instance the body or substance 0 is madeof glass internally coated with silver and with a suitable amalgan1,suchas mercury, and this bodyis in the present instance of the form of abulb or cyliuder, sealed at its upper extremity and open at its lowerextremity 5.

cl is an annular socket provided with a recess d for the reception ofthe neck of the exterior bulb a and with electrodes d for connecting thefilament c with the conductors or circuit connectionse and e. The loweropen extremity b of the reflecting body or substance b is fitted intothe annular socket d, and a vacuum-chamber f is formed around thefilament c and between the exterior bulb a and the reflecting-body b.

By reference to Fig. 1 it will be observed that a passage 9 is providedin the reflecting bulb or cylinder 1) for the admission of a supply ofair into the interior thereof.

In use the rays of light emanating from the filament c and falling uponthe body or substance are reflected outward from thelamp, and thus theavailable amount of illumination or candle-power given off by the lampis greatly augmented.

The body or substance Z2 is protected from any injury that might resultto it by reason of its being in close proximity to the incandescentfilament c by means of currents of air that constantly circulate throughthe passage g and around the interior of the reflecting body orsubstance Z2.

Having thus described the nature and objects of onrinvention, what weclaim as new, and desire to secure byLetters Patent, is

The herein-described incandescent electric lamp, provided with a hollowreflector of irregular, square, or elliptical cross section forming theinner wall of the vacuum-chamber thereof, and a filament having the twoparts thereof disposed in proximity to the points or ends of the hollowreflector, and said filament, connected with electrodes, sealed to thesocket of the lamp, the construction and arrangement being such that asupply of air is afiorded around about the internal surface of thereflector, whereby overheating or other damage to the reflector of thelamp is prevented, for the purposes set forth.

In witness whereof we have hereunto set our signatures in the presenceof two subscribing witnesses.

EPHRAIM E. \VEAVER. GUSTAVUS 13. MANYPENNY.

Witnesses:

J. WALTER DOUGLASS, THOMAS M. SMITH.

